/Engine/Plugins/FX/Niagara/Source/NiagaraEditor/Public/ViewModels/NiagaraSystemViewModel.h
void NotifyParameterRemovedExternally ( const [FNiagaraVariableBase](API\Plugins\Niagara\FNiagaraVariableBase) & InVar, [UNiagaraEmitter](API\Plugins\Niagara\UNiagaraEmitter) * InOptionalEmitter )